BELT 2090671 - Caterpillar

Table 1
Required Tools    
Part Number     Description     Qty    
8T-0857     Pressure Gauge     1    
177-7860     Hose     1    
8T-3613     Nipple     1    
6V-4143     Coupler     1    
8T-8902     Tee     1    
6V-3965     Fitting     1    
3J-1907     O-Ring Seal     2    
6V-8397     O-Ring Seal     1    
Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine.To prevent personal injury or death, perform the following:Park the machine on a smooth, level surface.Lower the work tool to the ground and engage the parking brake.Stop the engine and remove the key.Block the wheels and install the steering frame lock.
The pilot control valve is an electrohydraulic valve that controls the pilot oil pressure to each end of the main control valve spools. When the pilot control valve is activated, pilot oil pressure is supplied to one end of the spool in the main control valve. Next, the spool then moves away from the pressurized chamber in the main control valve.This procedure measures the oil pressure in a chamber of the main control valve in order to assist in troubleshooting the implement hydraulic system.
Ensure that the transmission control is in the NEUTRAL position.
Engage the parking brake.
Connect the steering frame lock.Reference: For more information about preparing the machine for troubleshooting, refer to the Service Manual moduleTesting and Adjusting, "Machine Preparation for Troubleshooting".
Release the pressure in the hydraulic system.Reference: For more information about releasing the hydraulic pressure, refer to the Service Manual module Testing and Adjusting, "System Pressure - Release" for the machine that is being serviced.
Illustration 1 g00871524
The main control valve is located on the top of the front frame. Remove the cover in order to access the main control valve.
Illustration 2 g00871536
Main Control Valve (1) Tip blade back. (2) Tip blade forward. (3) Tilt blade right. (4) Tilt blade left. (5) Raise blade. (6) Lower blade.
Illustration 3 g00871537
Pilot Lines (7) Main control valve. (8) Hose. (9) fitting.
Ensure that the blade is on the ground. Install a 6V-3965 Fitting to 8T-8902 Tee. Loosen the nut and remove hose (8). Install the tee to the fitting (9) on the end cap of the main control valve. Install the hose to the tee. The tee will need to be placed on each end cap in order to check each pilot pressure. The pressure taps for the 824G II Wheel Tractorare listed:
(1) Tip blade back
(2) Tip blade forward
(3) Tilt blade right
(4) Tilt blade left
(5) Raise blade
(6) Lower bladeNote: The 825G II Soil Compactor is equipped with lift and tilt. The 826G II Landfill Compactor is equipped with lift only.Note: Assemble the 8T-3613 Fitting and the 6V-4143 Coupler to the 177-7860 Hose .
Attach the hose assembly with 8T-0857 Pressure Gauge to the pressure tap that is installed on the main control valve.
Start the engine and warm the hydraulic oil to a normal